usb_ep_align(9)

💅 usb_ep_align(9) ✨

ok so this page lives in the Kernel API Manual, bestie — that's the manual name, that's where you'll find it. And the vibe? It's the little helper that rounds your buffer size up so it plays nice with your endpoint's maxpacketsize. Periodt. 🎀

---

🌸 NAME 🌸

usb_ep_align — returns @len aligned to ep's maxpacketsize.

(no cap, that's literally the whole job. tiny function, big main character energy 💖)

---

✨ SYNOPSIS ✨

size_t usb_ep_align (struct usb_ep *ep , size_t len );

two args in, a size_t out. cute, clean, slay. 🦋

---

🫶 ARGUMENTS 🫶

• ep — the endpoint whose maxpacketsize is used to align len. like, this is the endpoint doing the aligning, she's the standard here 👑
• len — buffer size's length to align to ep's maxpacketsize. the length that's about to get snapped into shape 💅

---

🔥 DESCRIPTION 🔥

okay so listen: this helper is used to align buffer's size to an ep's maxpacketsize. that's it. that's the function. you hand it an endpoint and a length, and it gives you back that length all lined up with the endpoint's maxpacketsize. the way that this is exactly what you need for buffer sizing… obsessed. 😭✨

ngl this is the kind of helper you don't appreciate until your transfer is off-by-a-few-bytes and you're crying in the group chat. keep her close. 💀

---

🌈 SEE ALSO 🌈

lowkey a whole friend group here, iykyk:

• Kernel file ./include/linux/usb/gadget.h 🧚
• struct usb_request(9)
• struct usb_ep_caps(9)
• struct usb_ep(9)
• free_usb_request(9)
• struct usb_gadget(9)
• usb_ep_align_maybe(9)
• gadget_is_altset_supported(9)
• gadget_is_stall_supported(9)
• gadget_is_zlp_supported(9)
• gadget_avoids_skb_reserve(9)
• gadget_is_dualspeed(9)
• gadget_is_superspeed(9)
• gadget_is_superspeed_plus(9)
• gadget_is_otg(9)
• struct usb_gadget_driver(9)
• usb_gadget_register_driver_owner(9)
• usb_gadget_unregister_driver(9)
• struct usb_string(9)
• struct usb_gadget_strings(9)
• usb_free_descriptors(9)

---

and that's the whole page, bestie — go align something iconic 💜

this one came from ./include/linux/usb, dated October 2026, and it's filed under usb_ep_align(9). mwah 🎀💋